why is Torah Sheb’al Peh an essential accompaniment to Torah She’bichsav? Give two examples of mitzvos in the Torah (besides the example of Sukkos that the Rambam mentions) which cannot be understood without Torah Shebe’al Peh. Which additional halachos related to that mitzvah are not clearly written down in the Torah She’bichsav but are learned from Torah Shebe’al Peh?